inferior cerebellar peduncle

(redirected from Restiform bodies)
Also found in: Dictionary, Encyclopedia.

peduncle

 [pe-dung´k'l]
1. a stemlike connecting part.
2. a collection of nerve fibers connecting between different regions in the central nervous system.
3. the stalk by which a nonsessile tumor is attached to normal tissue. adj., adj pedun´cular.
cerebellar p's three sets of paired bundles (superior, middle, and inferior) connecting the cerebellum to the midbrain, pons, and medulla oblongata, respectively.
cerebral peduncle the anterior half of the midbrain, divisible into a posterior part (tegmentum) and an anterior part (crus cerebri), which are separated by the substantia nigra.
inferior cerebellar peduncle a large bundle of nerve fibers serving to connect the medulla oblongata and spinal cord with the cerebellum (especially the archicerebellum and paleocerebellum); it courses along the lateral border of the fourth ventricle and turns dorsally into the cerebellum. Formerly called caudal cerebellar peduncle.
middle cerebellar peduncle a large bundle of projection fibers originating in the contralateral pontine nuclei and entering the cerebellum, conveying impulses from the cerebral cortex to the neocerebellum.
pineal peduncle habenula (def. 2).
superior cerebellar peduncle a large bundle of projection fibers arising chiefly in the dentate nucleus of each cerebellar hemisphere (neocerebellum) and ascending to decussate in the mesencephalon; its fibers end mostly in the red nucleus and thalamus. Spinocerebellar fibers to the paleocerebellum lie adjacent to each peduncle. Formerly called rostral cerebellar peduncle.
p's of thalamus the four two-way radiations of thalamocortical fibers that connect the dorsal thalamus with many parts of the cerebral cortex, which together form a major portion of the internal capsule and the corona radiata.

in·fe·ri·or cer·e·bel·lar pe·dun·cle

large paired bundles of nerve fibers that develop on the posterolateral surfaces of the upper medulla, extend under the lateral recesses of the rhomboid fossa and curve upward into the cerebellum caudomedial to the middle cerebellar peduncle; composed of a larger (lateral) bundle, the restiform body [TA], and a small (medial) bundle, the juxtarestiform body [TA]. Fibers forming this composite bundle originate from spinal neurons and medullary relay nuclei. The largest constituent (restiform body) contains crossed fibers from the inferior olive; it also contains the posterior spinocerebellar tract and cerebellar projections from the lateral reticular nucleus, the accessory cuneate nucleus, the paramedian reticular nuclei, the perihypoglossal nuclei, and other nuclei. Vestibulocerebellar fibers are placed medially in the inferior cerebellar peduncle and are separately identified as the juxtarestiform body.

inferior cerebellar peduncle

in·fe·ri·or cer·e·bel·lar pe·dun·cle

(in-fēr'ē-ŏr ser'ĕ-bel'ăr pĕ-dŭngk'ĕl)
Large paired bundles of nerve fibers that develop on the dorsolateral surfaces of the upper medulla, extend under the lateral recesses of the rhomboid fossa, and curve dorsally into the cerebellum medial to the middle cerebellar peduncle; composed of a larger (lateral) bundle, the restiform body, and a small (medial) bundle, the juxtarestiform body. Fibers forming this composite bundle originate from spinal neurons and medullary relay nuclei. The largest constituent (restiform body) is composed of crossed fibers from the inferior olive; it also contains the dorsal spinocerebellar tract and cerebellar projections from the lateral reticular nucleus, the accessory cuneate nucleus, the paramedian reticular nuclei, and the perihypoglossal nuclei. Vestibulocerebellar fibers are placed medially in the inferior cerebellar peduncle and are usually separately identified as the juxtarestiform body.